Product Data Sheet – MAGNAGLO MG 410

Wet Method Fluorescent Magnetic Particles

MAGNAGLO® MG 410 is a powder concentrate used to prepare fluorescent inks for high-sensitivity, wet method magnetic particle testing. The ink gives clear bright yellow/green indications when viewed in a darkened area under UV(A) of peak wavelength 365 nm.

MG 410 can be suspended in either a petroleum-based vehicle (oil), such as MG-MX Carrier II, or in water. If water is used, you must add a conditioning agent (such as MAGNAFLUX® WA-1) to improve particle suspendibility and mobility, surface wetting and corrosion inhibition.

Chemical product icon - fluorescent magnetic


Increases indication detection

  • Find smaller, finer indications in critical applications with these highly sensitive particles.

Minimises inspection time

  • Clear, bright indications form quickly with minimal background fluorescence.

Improve inspection consistency and reliability

  • Maintain magnetic particle system performance over longer periods of time thanks to the highly-durable, easily-dispersed particles.


  • Can be suspended in water or petroleum distillate (oil) vehicle
  • High sensitivity
  • Excellent fluorescent contrast
  • Excellent particle mobility
  • Optimised particle size distribution
  • Durable particles
  • Easily dispersed


Defect location: surface and slightly subsurface

Ideal for:

  • Detecting very fine to fine discontinuities
  • Critical applications
  • Machined parts
  • Smooth surface finish
  • After secondary processing
  • In-service inspections

Defect examples:

  • Inclusions
  • Seams
  • Shrink cracks
  • Tears
  • Laps
  • Flakes
  • Welding defects
  • Grinding cracks
  • Quenching cracks
  • Fatigue cracks


Compounded fluorescent pigment and magnetic iron oxide.

Specification Compliance

  • ASME B & PV Code, Sec V
  • ASTM E709
  • MIL-STD-2132D
  • MIL-STD-271F
  • NAVSEA 250-1500-1
  • SAFRAN In 5300

Product Properties

Form and colour Green powder
SAE sensitivity 7
Particle size range 14 – 22 µ
Recommended concentration range 0.75 – 1.5 g/litre
Settlement volume 0.05 – 0.15 ml

Like all Magnaflux materials, MG 410 is closely controlled to ensure batch-to-batch consistency, optimum process control and inspection reliability.

User Recommendations

NDT Method
Magnetic Particle Testing, Fluorescent, Wet Method
Storage temperature 10°C to 30°C
Usage temperature < 48°C
Suspension vehicles Water or MG/MX Carrier II
Water bath additives WA-1 water conditioner, WA-2 antifoam
Cleaner SKC-S
UV lamps EV6000, ST700
Accessories Centrifuge Tube

Instructions for Use

Clean the component before testing to reduce the risk of contamination and provide a suitable test surface.

Prepare the ink to the recommended concentration range of 0.75 – 1.5 g/litre.

  • Oil-based ink: Combine the required amount of powder with a suitable oil carrier, such as MG-MX Carrier II. Mix thoroughly until the powder is fully dispersed (this can take up to 15 minutes).
  • Water-based ink: First, prepare your water carrier by mixing 10g of WA-1 per litre of water. Then add the required amount of powder to the carrier and mix thoroughly until the powder is fully dispersed (this can take up to 15 minutes).

Before using your ink, check it has the correct settlement volume of 0.05 – 0.15 ml. You will need to continually agitate the ink during use to ensure uniformity of mix.

Apply by spraying, flooding or immersion, depending on your chosen method (see below):

Wet continuous method
Apply the ink to all surfaces of the component and apply a magnetising current. Remember to stop the flow of ink before the current is switched off, otherwise there is a risk that the force of the ink flood may wash away indications.

Wet residual method
This method is generally less sensitive than the continuous method and is more susceptible to rapid particle depletion and bath contamination.

  • Pre-magnetise the part to be tested.
  • Immerse the part in a bath of the ink.
  • Remove it and allow it to drain.
  • Inspect the part.

During use, the magnetic content of any ink will become depleted so you will need to check your bath strength at least once each day. The most widely-used way of checking an ink’s settlement volume is by using a graduated ASTM pear-shaped centrifuge tube.

When the settlement volume approaches the lower limit (0.05 ml), you can add more powder to the bath as long as it is still clean and uncontaminated. If the bath appears contaminated, or if it has been in use for a long time, replace the contents.

After inspection, remember to completely de-magnetise your components before cleaning, to ensure easy removal of any residual powder particles.

Packaging and Part Numbers

Part number 057C036

Packaging icon: 1kg round plastic tub

Health & Safety

Review all relevant health and safety information before using this product. For complete health and safety information, refer to the relevant Safety Data Sheet.

Download this Product Data Sheet as a PDF